Sharpening tool



Jan 6, 1931. T. A. JACKSON ET AL smmmume TOOL Filed April l6, 192sINVENTORS, 4, 72/400503 A (146160, 4 BYMLU/l/I d. 5x510 .ATTE OIRNEY Lil' Patented Jan. 6, 1931 UNITED STATES PATENT OFFICE THADDEUS A. JACKSON,01F BROOKLYN, AND WILLIAM J. SKELLY, OF NEW YORK, N. Y.

SHABPENING TOOL Application filed April 16,

Our invention relates to new and useful improvements in sharpeningtools, the object be ing to provide a device of the above characterwhich shall perform its work in an effective and expeditious manner.

The sharpening tool or device of our invention is particularly designedfor use in con nection with blades, such as those in knives, papercutters, mowers, reapers, and other cutting machinery.

Features of the invention may be found in the utilization of a length orbar of hardened steel or other suitable material formed with one or moresharpening edges or corners, said bar being suitably mounted incombination with a guide piece, for the various purposes to which it maybe applied.

For instance, for some purposes the sharpening bar may be applied to ananchored base to direct it upwardly from a table or the like, orhorizon-tally from a wall or the like.

The sharpening bar, for other purposes, may be provided with a handle,or it may be 'set into a groove formed in a block or base with thecutting edge of the bar rising above the plane of said block, and it maybe held in proper position by straps or other securing devices, andfurther, a wire or the like may be placed on the said block parallelwith the sharpening bar to provide a gage on which a blade may bear orrest to give proper angularity thereto when sharpening the same.

In order that the invention may beclearly understood and readily carriedinto efiect, the same will now be described more fully in detail withreference to the accompanying drawings.

In the drawings:

Fig. 1 is a side elevation of the improved blade sharpener secured to atable or other support; I

Fig. 2 is atop plan view of the same;

Fig. 3 is a side elevation of the bladesharpening device shown appliedto an ordinary handle for general use,

Fig. 4 is a composite perspective fragmentary view of the top portionsof a sharpening bar and a gage device inseparated relation;

Figs. 5 and 6 are detail crosssections show 1928. Serial No. 270,392.

ing other shapes of sharpening bars which may be employed;

Fi g. 7 is a perspective view of a preferred form of theblade-sharpening device; and

Fig.8 is an end view of the device shown in Fig. 7, partially brokenaway.

Referring now to the drawings in detail, 10 designates sharpening bar orlength of preferably hardened steel or the like, and preferablytriangular in cross-section. This bar may be supported in a boss 11integrally formed with a base plate 12 having openings 13 to receivescrews 14, whereby the bar 10 may be secured in a vertical position on atable or other support 15; or said bar may be secured in a horizontalposition on a wall or other vertical support, as will be obvious.

In carrying out our invention we may employ in combination with thesharpening bar 10, a guide or gage device 16, shown in Figs. 1 to 4inclusive, as formed of sheet metal and comprising a rear wall orportion 17, converging and yielding side walls or portions 18, andunitary therewith outwardly directed gage wings 19, against which theblade to be sharpened may rest or bear when moving it over thesharpening edge of the bar 10 to obtain the proper angularity of thesaid blade in the sharpening operation.

From the showing in the several views of the drawings, it will beobvious that the gage device 16 of the invention may be drawn off thesharpening bar when desired and returned thereto in a changed positionto present a new or another cutting edge than the last used.

The convergent walls 18 of the gage device are so bent or formedrelative to the rear wall thereof that they will exert a light spring oryielding bearing against the corresponding faces of the bar 10 toprevent the said gage device from sliding thereon, but may easily beremoved by grasping the same and urging it outwardly.

In Fig. 3 of the drawings is shown the improved sharpcning tool providedwith a handle 21 this form providing convenient means for sharpeningscythes, sickles, shears, paper-cutting blades, mower blades, and formany other sharpening uses.

In Figs. 7 and 8 of the drawings, We illustrate another embodiment ofthe lnventlon,

'in which a block or base piece 22 is formed with a longitudinal groove23, ofproper angular contour in cross-section to receive a sharpeningbar 10 which is removably held in placeby angularly. bent bridgingstraps 24 or the'like, secured to the block 22 by screws or otherdevices 25, while the bar 10 is preferably arranged in the groove withone ofits sides in a vertical plane;

The gage device 16, employed in the last above the base, angularly bentmeans for holding the cutting bar in its groove, and a gage devicedisposed in spaced and parallel relation with said bar.

In testimony whereof, wehave signed our names to this specification,this 2nd day of April, 1928. s

THADDEUS A. JACKSON.

WILLIAM J. SKELLY.

described form of the invention, may be constituted by a length of wireor other material 26, having its ends turned down an'd' back into theends of theblock as shown at 27 cc maintain said Wire parallel with thesharpene ing bar 10, and on this wire, blades to be sharpened may restto hold them at-the proper angle in the sharpening operation.

When sharpening a butcher knife or the like 011 the tool shown in Figs.7 and. 8 of the drawings, the blade is, given the proper",

horizontal angleby resting iton the cutting edge and onthe gag-e device1.6, as'indicated in dotted lines in Fig. 8,,alfter which it should betilted with the cutting edge in contact with the said edge 20 and gagel6 and with slight pressure drawn tothe right. V

or across the, cutting edge, thus cutting a thin shaving .or shavingsfrom the blade fafter which it is turned on the opposite sideand' i thesharpening operation. is repeated."

It will be apparent, by forcing the cutting j bar 10 endwise of itsgroove23, it maybe removed when one cuttmgedge 1s dull and replaced witha sharp edge presented uppermost for service, thuseXt-endingthe-effective.

life of. the tool;

It is thought that the operation and utility of the device will beapparentwithout fur? ther description, and it is to be understood Ithat-we-do not limit ourselves to the particuf lar arrangements of theparts, as many ref. finements may be made 1n the commercial appllcatlonof the device purpose set forth.

hat we claim-and. desire to secure by Letters Patent is: i

1. A" sharpening tool comprising having an angular in cross-sectiongroove extending longitudinally'thereof, a cutting bar partiallyreceived in said groove with a sharpening edge thereof above the top of.

3 a vertical planevand one of'its cutti11g edge s provided for the abase

